could roister
Verbe régulier : roister - roistered- roistered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could roister
you could roister
he could roister
we could roister
you could roister
they could roister 	I could be roistering
you could be roistering
he could be roistering
we could be roistering
you could be roistering
they could be roistering	I could have roistered
you could have roistered
he could have roistered
we could have roistered
you could have roistered
they could have roistered	I could have been roistering
you could have been roistering
he could have been roistering
we could have been roistering
you could have been roistering
they could have been roistering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't roister
you couldn't roister
he couldn't roister
we couldn't roister
you couldn't roister
they couldn't roister 	I couldn't be roistering
you couldn't be roistering
he couldn't be roistering
we couldn't be roistering
you couldn't be roistering
they couldn't be roistering	I couldn't have roistered
you couldn't have roistered
he couldn't have roistered
we couldn't have roistered
you couldn't have roistered
they couldn't have roistered	I couldn't have been roistering
you couldn't have been roistering
he couldn't have been roistering
we couldn't have been roistering
you couldn't have been roistering
they couldn't have been roistering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I roister?
could you roister?
could he roister?
could we roister?
could you roister?
could they roister? 	could I be roistering?
could you be roistering?
could he be roistering?
could we be roistering?
could you be roistering?
could they be roistering? 	could I have roistered?
could you have roistered?
could he have roistered?
could we have roistered?
could you have roistered?
could they have roistered? 	could I have been roistering?
could you have been roistering?
could he have been roistering?
could we have been roistering?
could you have been roistering?
could they have been roistering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I roister?
couldn't you roister?
couldn't he roister?
couldn't we roister?
couldn't you roister?
couldn't they roister? 	couldn't I be roistering?
couldn't you be roistering?
couldn't he be roistering?
couldn't we be roistering?
couldn't you be roistering?
couldn't they be roistering? 	couldn't I have roistered?
couldn't you have roistered?
couldn't he have roistered?
couldn't we have roistered?
couldn't you have roistered?
couldn't they have roistered? 	couldn't I have been roistering?
couldn't you have been roistering?
couldn't he have been roistering?
couldn't we have been roistering?
couldn't you have been roistering?
couldn't they have been roistering?